Improve performance for realtime moving marker?

[StefanK]

Hello,

I have a plot (see attachment) which shows data over timeline. I use a panner and magnifier for user interaction. In addition I have a realtime 'player' (timer) which updates a time marker walking over the plot. The marker is updated every 100ms. Actually a QwtPlotMarker is used. As we need to replot() every time when the position of the marker changes, the application becomes slow, depending on the number of plot curves and the timer interval. The number of plot curves is generically variable and can be more than 10.

Is there any idea how to get the same view with better performance?

Best Regards
Stefan